Chuck for rock-drills.



.1.0. H. VAUGHT.

CHUCK FOR ROGK'DRILLS.

APPLICATION FILED 11111.11. 1909.

1,083,310. Patented Jan. 6, 1914.

3. SHEETS-SHEET 2.

` j@ WWW (www www.,

J1 C. H.. VAUGHT.

CHUCK POR ROCK DRILLS.

APPLIOATION FILED JAN.11.1909.

1,083,310. Patented Jan.6,1914.

@Mannion 2511 v l K amm.,

UNITED STA'ISEQAIENT OFFICE.

JAMES C. H. VAUGHT, OF GLOBE, ARIZONA.

CHUCK FOR ROCK-DRILLS.

Application filed January 11, 1909.

T 0 all l'whom it may concern.'

Be it known that I, JAMES C. H. VAUGHT, a citizen of the United States, residing at Globe, in the county of Gila, Arizona, have invented certain new and useful Improvements in Chucks for Rock-Drills, of which the following is a specification.

This invention relates to chucks for rock drills, and palticularly to a gib and selftightening sleeve connection, and yielding v retaining and releasing devices for the sleeve.

rl`he object of my invention is to provide in a chuck, improved means for causing a sliding sleeve to tighten and retain its grip on the gib which engages and holds a drill shank in its socket, and means for facilitating disengagement of t-he sleeve from the when the drill is to be removed from the chuck.

Another object is to provide effective yielding devices for retaining the sliding sleeve on the body of the chuck after being released from the gib, to facilitate the operation of changing drills.

Another object is to provide improved details of construction for making a more effective, durable and quick-acting drill-chuck than any heretofore known in practical use.

This invention embraces improvementsV in the chuck for rock drills, covered by Letters Patent No. 804,901 granted to me Nov. 2l, 1905.

The illustrations show embodiments of the invention which I have found, in practice. to give satisfactory results, and the details of construction will now be described by reference to the accompanying drawings, in which Figure l represents a longitudinal section showing my self-tightening chuckfor rock drills. Fig. 2 represents a transverse section on line 2 2, Fig. l. Fig. 3 represents a transverse section on line 3 3, Fig. 1, with the gib, and the retaining and releasingkey omitted. Fig. et represents a sectional side elevation of a yielding retaining and releasing key. Fig. represents a cross section thereof, on line 5 5, Fig. 4. Fig. (3 represents a longitudinal section, showing a modification of my chuck. Fig. 7 representis a transverse section on line .7, Fig. 6. Fig. S represents an elevation of a gib. Fig. 9 represents a side or edge view of the preferred form of curved spring bar retaining device. Figs. l0 and 11 represent respectively, a bottom plan view and a vertical Specification of Letters Patent.

Patented Jan. 6,1914. Serial No. 471,721.

section of portions of a chuck showing screw-threaded openings for set screw bushing devices. Fig. 12 represents a top plan view of the body shown in Fig. 11.

In constructing my drill chuck, a substantially cylindrical body A is forged, or otherwise formed, upon the piston rod B, and in the body is bored,or otherwise formed, a longitudinal central socket a, Figs. l and 2, which is provided with a steel bushing o, which, preferably stops short of the outer end of the socket as shown in Fig. 1. The socket, with bushing, receives the shank 0 of a drill C. In the body A, is made a longitudinal angular groove a and in the sleeve E is made a corresponding groove a, Figs. 2 and 3, to receive a retaining and releasing key G, Figs. 4f and 6. groeven in the body forms a guideway for the key, to keep it in longitudinal alinementand from lateral displacement, so that when the sleeve and key are pushed back there shall be no jamming or binding of the parts. A longitudinal slot D is cut through the body, and a similar slot b is cut through the bushing into the socket a, of suitable dimensions to receive the body portion yof a gib F. At the surface opening of slotV D, the edges of the body are cut away to form flat bearing shoulders d, Figs. 2 and 3,.'for the flanges f of the gib when the shank c is removed from the chuck. The gib F is constructed with a body portion having substantially parallel sides, and at the top, or outer portion, with flanges f, forming an elongated head as shown in Figs. l and 2. As indicated in Figs. 2 and S, the flanges are deeper or thicker at the forward end, and thinner at the rear end of the gib. The outer face f is inclined or tapered, as indicated in Figs. l, 6 and 8, to serve as a bearing for the sliding sleeve, and the inner face f is made transversely concave to fit upon shank c of the drill. Heretofore the outer face of the gib has been made with a taper of about an inch and a half to the foot, and occasionally the sleeve E would ride up very tightly on such tapered face, making it diiiicult to release the same. In order to overcome this difficulty, I, preferably, increase the taper to about an inch and three quarters, or two inches, to the foot. I also provide other improved means for quickly and easily releasing the sleeve from yengagement with the gib, as described below.

The sleeve E is made with an opening to readily slide on the body A, and with an interior longitudinal groove c to receive the flanged head of the gib, as indicated in Figs. i2, 3 and 7. llxternally, it is provided with longitudinal. enlargements or ribs e. c, for containing the longitudinal grooves for the head of the gib and a retaining key G, also with circular strengthening ribs 6. The groove c is made with an inclined or tapered outer face et, Figs. and t3, corresponding. approximately, to the tapered out-er face of the gib. The sleeve is also provided with a longitudinal groove am, extending into rib c, Figs. 3 and 7, for the key (l.

It sometimes happens with drill-chucks, as heretofore constructed7 that the sleeve will not tighten on the gib, di'iring operation of the drill, but will rattle between the gib and a rear retaining device heretofore used; also the sleeve will sometin'ies bind on the gib, so that it cannot be readily released. In order to overcome these defects and provide for surely tightening and holding the sleeve on the gib, for preventing rattling during operation of the machine, for quickly and easily releasing the sleeve from the gib and for retaining the sleeve on the body of the chuck when it is purposely released from the gib, l have devised a retaining and releasing key Gr, Figs. l, 4 and G. This kev G Consists of an elongated body, having an inclined or tapered outer face g from its inner end toward the middle, forming a wedge-shaped portion g, and having at its outer end a projecting calk, f/ which forms an abutting shoulder for bearing on the sleeve in the releasing operation. ln the inner face is made a` shallow groove g for receiving a curved or arc-shaped springbar l1, which. as shown in Fig. el, may be secured at its outer end by a rivet c' to the key. This rivet connection, however. is not essential. At the inner end of the groove o in the bodv A. is made a recess o* Fig. l. having a double inclined or curved bottom oi as a bearing and stop for the end of spring Il, to prevent the sleeve and key from backing off from the chuck. l may provide an annular cap J. having a reduced screwthreaded extension adapted to be screwed into a screw-threaded opening in the body and form part of the bushing of the socket a. as shown in Fig. l.

A modification of my yielding retaining and releasing key. and connecting devices. and probably the most effective construction for preventing the sleeve from backing off from the chuck body, and other purposes, is illustrated in Figs. 6 and 7. The body A, the' sleeve E and the retaining key G are made very much like the corresponding parts shown in Figs. l, 2 and 3, the body being provided with a socket a, a longitudinal groove o, and the sleeve having a longitudinal groove o" which registers with the groove o', and a longitudinal groove c to receive the flanged head of the gib F. The body also provided with a large slot D, leading into the socket a, for receiving the gib, and with a groove cl3, Figs. (i, l() and ll, for receiving the flange and calk of the gib. and the key G is provided with a forwardly projecting calk g, a wedgeshaped portion g, and a groove g, on its under side. The rear end is beveled to form a bearing shoulder y, as shown in Fig. G for abutting against a similar shoulder y?" on the projection or lug 72 at the end of the spring-bar H6. This bar is curved as shown in Fig. 9, and is detachable. It is provided at its rear end and under side with a calk or stud 7i, adapted to fit into a socket Z in the body B as shown in Fig. (i. The projection y) is provided with a transverse eye 0 for inserting a hook or rod, or miners Candlestick to lift and withdraw the bar from its groove when it is desired to remove the sleeve. The spring bar I may be readily inserted in place by moving the sleeve and key slightly backward and then placing the thin end of the bar in the groove g and the stud lz in the socket Z. Evidently the curved spring bar HG will bear upon the key G so as to make it yielding` and keep it in engagement with the sleeve and also prevent rattling of the parts during operation of the drill.

The lower and upper longitudinal ribs e and c, Fig. 7, are provided with longitudinal grooves fr adjacent to the body of the sleeve for providing edges on both sides of the rib. lvlhen the machine is ruiming but the piston fails to revolve, theA operator may give one of the ribs a blow with any suitable tool for starting revolution of the drill and the edges produced by the groove will prevent the tool from sliding or glancing oli'. as itl is apt to do in case the grooves and edges are not provided.

The gib F is modied by the addition of a calk.` or lug f", at its forward end, as shown in 6 and 8. A groove cl3, Figs. (i, l0 and l1. is preferably made in the body A to receive the flanged portion of the gib. The calk ft serves to limit the forward movement of the sleeve E, and to offset the weight of calk g and make a wellbalanced. chuck.

As a substitute for the cylindrical bushing 7), shown in Figs. l, 9. and 3, I provide a readily detachable and adjust-able bushing in the ferm of set-screws S, Figs. 6 and 7. Large openings T, Fig. 1l, are bored transversely into the body A. preferably from the face of the groove a, into the longitudinal socket o, said opening being preferably the full diameter of the socket as shown. These openings T are screw threaded. The setscrews S are screw-threaded and provided at their upper ends with square sockets s for receiving a wrench, and with lower concave faces s to conform to, and bear upon the shank c. Two of these set-screw bushings may be applied to one body, as indicated in Figs. 6 and 12, and they will be adjusted so as to bear fully upon the shank directly opposite the gib F. It will be understood that when the concave face s becomes worn, the setscrew S nay be given a one-half turn, orV

one complete turn to set it down into the longitudinal socket a. This can be done very quickly, and the set screws make a much more economical bushing than the kind heretofore used. This kind of adjustable bushing can also be used on t-he old style of chuck, such as those provided with U bolts. Any desired number of these set-screws may be used, according to the length of the body and socket a. Then the piston is worn out the set-screw bushings can be removed and used on another chuck.

By the operation of t-he drill and impact of same on the rock, the sleeve E is automatically driven onto the inclined face of the gib, thereby forcing it against the drill-shank and holding the same in its socket; and the wedge-shaped retaining and releasing key is also driven forward, While subjected to pressure of the spring bar, and exerts a yielding or spring pressure on the sleeve, keeping it in engagement with the gib. The sleeve being heavier than the key will be first driven forward and the key will immediately follow, and by reason of its wedge shape-with a face inclined in reverse direct-ion from the inclined face of the gib-will retain the sleeve on the gib, so that the latter will be securely forced and held against the shank of the drill. The sleeve is thus prevented from bouncing 0E from the gib and from rattling by to and fro movement between the gib and the back stop during operation of the drill. lVhen a drill is to be reroved and replaced by a new one, the operation will be quickly performed by a blow on the outer end or calk g of the retaining and releasing key, thereby driving it back against the sleeve fo, and carrying the wedge shaped portion g" and the sleeve backward. The gib will thereby be released, so that the lshank can be taken out and another one inserted in the socket. In this backward or retracted position of the sleeve and wedge key, the spring exerts sufficientpressure on the key between the body and the sleeve to hold the sleeve and key in such retracted position while changing drills when the drill is pointed downward The spring bar with its projection p, Fig. G, or its downwardly turned end, Fig. 4L, will prevent the sleeve from backing off from the body, but will permit it to be slid back far enough to let the gib fall away from engagement with the shank, so that the latter may be withdrawn from its socket and replaced by a new one. This operation is quickly and easily performed with my improved devices.

VHaving described my invention, what I claim, and desire to secure by Letters Patent, is Y Y l. In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, a yielding key between the body andV sleeve, a spring adapted to press the key against the sleeve and means for preventing the sleeve from backing off from the body.

2. In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, a key between the body and sleeve, a curved spring bar between the body and key to keep the parts in engagement and having means to prevent the key and sleeve from backing 0H' from the body.

3. In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a retaining and releasing key having an inclined face and outer shoulder, a sleeve adapted to work over the gib and key, a curved spring bar adapted to exert pressure 0n the key between the body and sleeve and having means to engage it with the body and prevent the sleeve from backing off from the body when released from the gib.

4l. In a drill chuck, the combination with a body having a shank socket vand a slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, a retaining and releasing key having an inclined face and an outer shoulder adapted to bear respectively on the interior and the end of the sleeve, and a spring bar adapted to exert pressure on the key between the body and sleeve to keep the parts in engagement and having means on its outer end to prevent the sleeve from backing oill from the body when released from the gib.

In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, a yielding retaining key having an inclined or slanting face bearing on the sleeve, and a spring adapted to exert pressure on the key between the body and sleeve, substantially as described.

6. ln a drill chuck. the coinbinaticn with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, a retaining and releasing key having an inclined or slanting cuter face for bearing on the interior ot the sleeve, and an outer shoulder for bearing on the end of the sleeve, and a spring adapted to exert pressure on the key between the body and sleeve, substantially as described.

7. ln a drill chuck, the combination with a body having a shank-socket, a slot leading thereto Jfor a gib, and a second socket or re.- cess, of a sliding sleeve working over the gib, a. key between the body and sleeve, a curved spring bar having a stud on its under tace adapted to fit in said second socket, and a projection on its upper tace adapted to serve as a stop for the key and prevent the sleeve from backing oil troni the body, substantially as described.

S. In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a retaining key, a` longitudinally sliding sleeve working over the gib and key, a curved spring bar between the key and body adapted to be engaged with the body and h aving an outer projection at its end to serve as a stop for preventing the sleeve from backing off from the body, substantially as described.

9. In a drill chuck, the combination with a. body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a retaining and releasing key, a sleeve adapted to work over the gib and key and having two exterior longitudinal ribs provided with interior longitudinal grooves, to accoininodate the gib and key, substantially as de'- scribed.

l0. ln a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a. retaining and releasing key, a sliding sleeve having two interior longitudinal grooves flaring outward in opposite directions tor receiving respectively, the gib and key and working over the sa nie, substantially as described.

ll. lu a drill chuck, the combination with a body having a shanksocket, and a gib slot leading thereto, of a gib having an inclined outer Jface, a releasing key having an oppositely inclined outer face, and a sliding sleeve provided with grooves to engage the gib and key and torce the gib inward, substantially as described.

l2. In a drill chuck, the combination with a body having shank socket and a gib slot leading thereto, of a gib having an inclined outer face, a wedge key having an oppositely inclined outer face, and a longitudinally inovable sleeve on the body adapted to slide over the gib and key to 'torce the gib inward, said key also having a longitudinal inoveinent to aid in retaining the sleeve on the gib during operation of the drill and to permit the sleeve to be released tor changing drills.

l. In a drill chuck, the combination www with a body having a shank socket and a gib slot leading thereto, of a gib having an 1nclined outer face, a longitudinally movable sleeve on the body to force the gib inward, and a releasing wedge key having a shoulder which may be caused to bear on the sleeve to force it backward and release it t'roin the gib when changing drills.

il. chuck body for receiving a drill shank, a longitudinally movable sleeve surrounding the chuck, a clamping gib and a wedge key located upon opposite sides of the chuck within said sleeve, said clamping gib engaging the shank and sleeve, and said wedge key engaging the chuck body and sleeve.

l5. A, chuck body for receiving a drill shank. a longitudinally movable sleeve surrounding the chuck body, a clamping gib having an inclined outer tace, and a wedge key located upon opposite sides of the chuck within said sleeve, said gib engaging the drill shank and sleeve, and said wedge key engaging the chuck body and sleeve.

16. ln a drill chuck, the combination with a body having a shank socket and a slot leading thereto, of a gib having an inclined outer "face, a longitudinally inovable sleeve on the body to torce the gib inward, and a wedge key adapted to slide longitudinally on the body andrbear on the sleeve to retain the saine against backward movement during operation of the drill.

17. ln a drill chuck, the combination with a body having a shank socket and a` slot leading thereto, of a gib having an inclined outer face, a longitudinally movable sleeve on the chuck body to force the gib inward, a wedge key adapted to slide on the body and bear on the sleeve, and a spring adapted to evert pressure on the key between the body and sleeve to hold the latter in retracted position while changing drills.

18. ln a drill chuck, the combination with a body having a shank socket, a gib slot leading thereto and a key groove, of a gib having an inclined outer face, a longitudi nally inovable sleeve on the chuck body to force the gib inward, a wedge key adapted to slide in said groove and bear on the sleeve to positively hold the sleeve in engagement with the gib and to prevent the sleeve from backing oli' troni the latter dni-ing the drilling ope "ation,

1.9. ln a drill chuck, the combination with a body having a shank socket, a gib slot leading' thereto and a key groove, of a gib having an inclined outer tace, a longitudinally movable sleeve having exterior longitudinal ribs and interior grooves, a shouldered retaining and releasing key working in grooves respectively in the sleeve and body to hold the sleeve in positive engagenient with the gib while the latter is in engagement with the drill shank, and a spring 'adapted to exert pressure between the body and sleeve to hold the latter in retracted position while changing drills.

20. In a drill chuck, the combination with a body having a shank socket, a gib slot leading thereto and a key groove, of a longitudinally movable sleeve having exterior longitudinal ribs and interior grooves, a shouldered releasing key working in grooves respectively in the sleeve and body, a gib engaging one of the grooves in the sleeve, and means to hold the parts in position and prevent the sleeve from accidentally backing oft from the chuck body, substantially as described.

2l. In a drill chuck, the combination with a body having a shank-socket, a gib-slot leading thereto, and a longitudinal keygroove, of a gib having an inclined outer face, a retaining and releasing key having an oppositely inclined outer face, a sliding sleeve having two interior longitudinal grooves iiaring respectively toward its opposite ends for receiving and working over the gib and key, substantially as described.

22. In a drill chuck, the combination with a body having a shank-socket and Va slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, and provided with exterior longitudinal ribs havin' exterior grooves, for the purpose described.

23. In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, and a yielding retaining key having a shoulder on one end to provide means to force the sleeve to disengage from the gib, a curved spring bar having a calk on one side and a projection andl shoulder on the opposite side as a bearing to prevent the sleeve and the retaining key from backing oil from the chuck body, substantially as described.

24. In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, of a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward and a yielding retaining-key having a beveled bearing shoulder at one end, and a. curved spring bar having means for engaging it with the body, and an outer projection as a bearing for said shoulder on the key, substantially as described.

25. In a drill chuck, the combination with a body having a shank-socket and a slot leading thereto, or" a gib adapted to the slot, a sleeve adapted to work over the gib and force it inward, and a yielding retaining-key provided with an outer bearing shoulder to abut against the sleeve and cause it to disengage from the gib, and a beveled bearing shoulder at the other end, and a curved spring bar having means to engage it with the body and an outer bearing shoulder adapted to receive the shoulder on the key and prevent the sleeve from ba-cking orf from the chuck body, Vsubstantially as described.

26. In a drill chuck, a body having a socket to receive a drill shank, a slot for a gib and an outer longitudinal groove provided at its rear end with a socket or recess, in combination with a gib, a retaining key having a beveled shoulder, in said groove, a curved spring bar having a stud adapted to lit in said recess and an outer projection provided with a beveled shoulder as a bear ing for said shoulder on the key, to prevent the sleeve from backing ofi", and a sliding sleeve adapted to work over the gib and key and to force the gib into engagement with the drill shank, substantially as described.

27. In a drill chuck, the combination with a body, having a shank-socket and a gib slot and a screw-threaded opening leading thereto, of a gib in the slot, a detachable bushing consisting of a set-screw, having a concave inner face, and working in said screw threaded opening, and means for forcing the gib into engagement with the shank, substantially as described.

28. In a drill chuck, the combination with a body, having a shank-socket, a slot and a screw threaded opening leading thereto, of a gib in the slot, a detachable screw-threaded bushing set in said openingv opposite the gib and adapted to be adjusted inward toward the shank socket and means for forcing the gib into engagement with the shank, for holding it in place, substantially as described.

29. In a drill chuck, the combination with a body, having a shank-socket, a slot and a screw-threaded opening leading thereto, of a gib in the slot, a detachable set-screw bushing set in the screw-threaded opening and a sliding sleeve working over the gib for forcing it into engagement with the shank, substantially as described.

30. In a drill chuck, the combination with a body having a shank-socket, a gib slot and a key groove, of a gib and a key having outer bearing faces inclined respectively in opposite directions, a sliding sleeve having interior bearing faces inclined to correspond with those on the gib and key, and a spring pressure device adapted to bear on the body and key, substantially as described.

In testimony whereof I aiix my signature in presence of two witnesses.

JAMES C. I-I. VAUGHT. Witnesses:

JAMES A. OCONNELL, CHAS. B. Y. I-IIND.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

